According to an embodiment of the present invention, a tidal power generator may comprise: a plurality of channel levees which are arranged spaced apart from each other so as to form a channel having a constant width and which have a plurality of installation grooves, each being formed by recessing the surface facing the channel, wherein a tidal current can move forward/backward in the channel; a first water collection levee extending from the front end of the channel levees with reference to a movement direction of the tidal current and having a peak shape of which the width is gradually reduced towards the front side of the channel; a second water collection levee extending from the rear end of the channel levees with reference to the movement direction of the tidal current and having a peak shape of which the width is gradually reduced towards the rear side of the channel; and a waterwheel module which is inserted and installed in the installation groove and can generate power using movements of the tidal current.

A hydroelectric turbine designed to operate in a bi-directional reversing water flow caused by ocean waves, comprising an annular stator with two axially spaced sets of a plurality of guide vanes placed along its circumference that are inclined in the axial direction, an annular rotor with a plurality of concavo-convex blades placed along its circumference with an electric generator attached to it. The rotor is placed to rotate about its axis between the two sets of the stator guide vanes. Wherein, the stator and rotor are placed within the cylindrical part of an hourglass-shaped double funnel so when the ocean wave moves in one direction, the water flow enters the turbine through one end of the double funnel (inlet) and passes through the channels formed by one of the stator guide vane sets towards the rotor blades. The channels formed by the stator guide vanes are inclined at an angle to the rotor rotation plane, so that the water flows in the direction of the rotor rotation. After passing through the channels formed by the rotor blades and the channels formed by the other set of the stator guide vanes the water flows out of the turbine through the opposite end of the double funnel (outlet). When the wave moves in the opposite direction and the water flow direction reverses accordingly, the outlet becomes the inlet and the inlet becomes the outlet. The turbine keeps rotating in the same direction, transmitting the rotation to the electric generator and providing continuous high efficiency energy conversion.

An apparatus and method for extracting energy from an oscillating working fluid, such as ocean waves includes an apparatus (10) having an internal flow passage (40) for the working fluid, a turbine (44) and a flow control device (38), each of the turbine (44) and the flow control device (38) being in direct fluid communication with the flow passage (40), where the flow control device is selectively moveable between a first configuration in which the flow control device is open to allow a flow of the working fluid, such as air, to exit the flow passage therethrough, and a second configuration in which the flow control device restricts a flow of the working fluid therethrough, the working fluid then entering the flow passage via the turbine, which can be harnessed to generate electricity.

A hydropower generator includes: a driving shaft installed along a path through which a fluid flows; a plurality of blade assemblies installed along a lengthwise direction of the driving shaft; a spinning supporter connected to rotatably support the driving shaft; a power generator receiving a spinning force of the driving shaft and generating electricity; and a flow pipeline internally provided with the driving shaft along a lengthwise direction thereof and formed with a channel through which a fluid flows.

A turbine arrangement for a bi-directional reversing flow is provided. The turbine arrangement may include a rotor rotatably mounted to rotate about an axis of the turbine arrangement, and the rotor may have a plurality of rotor blades disposed circumferentially thereabout. A first set of guide vanes may be circumferentially disposed about the axis for directing the bi-directional reversing flow to and from the rotor blades via a first flow passaged defined by a first duct. A second set of guide vanes may be axially spaced from the first set of guide vanes and circumferentially disposed about the axis for directing the bi-directional reversing flow to and from the rotor blades via a second flow passage defined by a second duct. The guide vanes may be disposed at a greater radius than the rotor blades, such that the guide vanes are radially offset from the rotor blades.

A closed dual-bladder wave energy system that is capable of capturing a continuous supply of energy derived from wave movements for nearshore implementations. Rather than employing an onshore bladder in communication with an offshore bladder, and rather than focusing on capturing more incremental potential energy derived from tidal movement, the system accomplishes continuous captures potential energy from waves via a dual-bladder system employed offshore. Fluid within the system translates between a first offshore bladder and a second offshore bladder based on a pressure differential between a crest and a trough of a wave external to the system. By utilizing compliant bladders, the system is capable of capturing energy even during inclement weather conditions without the risk of faults resulting from strong waves. As such, the system provides for the efficient and effective capture of potential energy from waves in any weather condition and in any water environment that experiences waves.

This invention provides a rolling bearing protection device and a vertical-axis tidal current energy generating device applying the same. The vertical-axis tidal current energy generating device includes a frame, a vertical-axis hydraulic generator, a rolling bearing, and a rolling bearing protection device. The vertical-axis hydraulic generator includes a main shaft disposed vertical to a horizontal surface, one end of the main shaft is rotatably disposed at a bottom of the frame. The rolling bearing is sleeved on one end of the main shaft. The rolling bearing protection device is disposed above the rolling bearing. The rolling bearing protection device includes a first sealing protection device, a first water leak-proof chamber, and a second sealing protection device disposed in sequence along a gravity direction.

An apparatus and method is disclosed for extracting energy from an oscillating working fluid, such as ocean waves. The apparatus (10) comprises an internal flow passage (40) for the working fluid, a turbine (44) and a flow control device (38), each of the turbine (44) and the flow control device (38) being in direct fluid communication with the flow passage (40), wherein in use the flow control device (38) is selectively moveable between a first configuration in which the flow control device (38) is open to allow a flow of the working fluid, such as air, to exit the flow passage (40) therethrough, and a second configuration in which the flow control device (38) restricts a flow of the working fluid therethrough. In such an instance, the working fluid then must enter the flow passage (40) via the turbine (44), which can be harnessed to generate electricity.

This invention provides a rolling bearing protection device and a vertical-axis tidal current energy generating device applying the same. The vertical-axis tidal current energy generating device includes a frame, a vertical-axis hydraulic generator, a rolling bearing, and a rolling bearing protection device. The vertical-axis hydraulic generator includes a main shaft disposed vertical to a horizontal surface, one end of the main shaft is rotatably disposed at a bottom of the frame. The rolling bearing is sleeved on one end of the main shaft. The rolling bearing protection device is disposed above the rolling bearing. The rolling bearing protection device includes a first sealing protection device, a first water leak-proof chamber, and a second sealing protection device disposed in sequence along a gravity direction.

Apparatus for extracting energy from an oscillating working fluid, the apparatus comprising a flow passage 40 for the oscillating working fluid, an energy conversion unit 44 and a flow control device 38, each of the energy conversion unit 44 and the flow control device 38 being, at least in part, in fluid communication with the flow passage 40, wherein in use the flow control device 38 is selectively operable between a first configuration in which the flow control device 38 is open to allow a flow of the oscillating working fluid to exit the flow passage therethrough, and a second configuration in which the flow control device 38 is arranged to restrict a flow of the working fluid therethrough, such that the oscillating working fluid enters the flow passage via the energy conversion unit 44.